Swift Learning tuple (tuple)

Defined

Tuples are composed of several types of data, the data that makes up a tuple is called an element, and the type of each element can be arbitrary.

Usage One

Let Tuples1 = ("Hello", "World", 2017)

Tuples are the same as arrays, and the corners of their elements can be tuple1.0 tuple1.1 tuple1.2 starting from 0.

Print ("Get first value \ (tuples1.0), get the second value \ (tuples1.1), get the third value \ (tuples1.2)")

Usage Two

Let Tuples2 = (first: "Hello", Second: "World", third:2017)

The values of the tuples used in this use can be Tuple2.first tuple2.second Tuple3.third

Print ("Get the first value \ (Tuples2.first), get the second value \ (Tuples2.second), get the third value \ (Tuples2.third)" )

Usage Three

Variable receiving numerical method

Let (x, Y, Z) = ("Hello", "World", 2017);

Print ("Get X is \ (x) get y are \ (y) get Z is \ (z)")

Use _ to remove the value of some elements ignore _ corresponding value

Let (A, _, B) = ("Hello", "World", 2017);

Print ("Get X is \ (a) Get z-is \ (b)")

Tuples Worth modifying

Let Tuples2 = (first: "Hello", Second: "World", third:2017)

The values of the tuples used in this use can be Tuple2.first tuple2.second Tuple3.third

Print ("Get the first value \ (Tuples2.first), get the second value \ (Tuples2.second), get the third value \ (Tuples2.third)" )

This will cause an error

Tuples2.first = "Test"; The let before tuple2 should be changed to Var to make tuples into variable tuples

var tuples2 = (First: "Hello", Second: "World", third:2017)

The values of the tuples used in this use can be Tuple2.first tuple2.second Tuple3.third

var print ("Get the first value \ (Tuples2.first), get the second value \ (Tuples2.second), get the third value \ (Tuples2.thi RD) ")

Tuples2.first = "Test";

Print ("Get the first value \ (Tuples2.first), get the second value \ (Tuples2.second), get the third value \ (Tuples2.third)" )

Advanced Applications for tuples

Defines a function that can exchange two elements in an array

Func swap<t> (_ Nums:inout [T], _ P:int, _ Q:int) {

(Nums[p], nums[q]) = (Nums[q], nums[p])

}

var array = ["Hello", "World") as [any]

For value in array {

print (value);

}

Swap (&array, 0, 2)

For value in array {

print (value);

}

Swift Learning tuple (tuple)